Mistakenly tried to update to latest version. (help)

[mihai.s]

Click on expand/colapse (the arrow on the right - V ), see the tutorial and choose “Repair”

Display Sktchup drawing files

See this: [How to Fix Sketchup Thumbnails Not Showing 2015 / 2016 / 2017 / 2018 / 2019 / 2020 / 2021 Tutorial] The cause of your thumbnails not showing mostly because of you recently just installed newer, older, or different version of sketchup into your PC. You’ll choose “Repair”.